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But now the crews operating over Iraq from the Ali Al Salem airbase in northern Kuwait are about to go to the opposite extreme and use "inert bombs".

These are basically blocks of concrete shaped as bombs and painted blue to identify them as non-explosive if they are discovered still intact after the war.

Great accuracy

But they will be laser-guided 1,000lb blocks of concrete, capable of destroying a tank or artillery piece, but without causing a devastating explosion that would put civilians at risk and shatter surrounding buildings.

BBC NEWS | World | Middle East | Tornadoes to drop 'concrete bombs'